Update packit config after tier redefinition

[fernflower]

Now for basic sanity test verification in upstream tests tagged by 'tier0' will be used instead of 'sanity'.

RHELMISC-3211

[github-actions]

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[fernflower]

Please don't merge until QE give their blessings.

[mm0ran]

The anchors are still named "sanity" e.g. &sanity-abstract-8to9 but if that's OK, LGTM!

[fernflower]

/packit test

[fernflower]

/packit copr-build